Agreed, it's not worth it even if you install linux and mine Yac. Also you might damage your imac from the heat. Like others have suggested, your best bet is to start with Litecoin or one of the scrypt based alts on a build like this:
https://bitcointalk.org/index.php?topic=163306.0 Even then you won't be making about 3 or 3.5 litecoin per day at current difficulty. Using
http://www.coinwarz.com/cryptocurrency/?sha256HashRate=1800.00&sha256Power=500.00&sha256PowerCost=0.00&scryptHashRate=1800.00&scryptPower=500.00&scryptPowerCost=0.00 or
http://dustcoin.com/mining can help you plan and decide which coin will give you the best bang for your buck. Hope that helps and good luck!
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